Significant Accounting Policies - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2008	Dec. 31, 2006
Business Acquisition [Line Items]
Allowance for doubtful receivables	$ 0	$ 0
Depreciation rate for other capital assets	30.00%
Goodwill	$ 102,581,000	102,581,000
Goodwill impairment	$ 0
New Accounting Pronouncement, Early Adoption, Effect [Member]
Business Acquisition [Line Items]
Deferred tax liabilities, current		1,000,000
Deferred tax assets, current		$ 1,600,000
Solana [Member]
Business Acquisition [Line Items]
Goodwill			$ 87,600,000
Argosy [Member]
Business Acquisition [Line Items]
Goodwill				$ 15,000,000